In SGML lingo, an entity is an abstract representation of a resource or a file in a document.
在SGML的方言中，实体是资源或者文档文件的抽象表示。
DTD is used by SGML applications, such as HTML, to specify rules that apply to the markup of documents of a particular type, including a set of element and entity declarations.
DTD是通过SGML应用程序来使用的，就像HTML，来指明适用于特殊类型的文档标记，包括元素集合和特殊个体的声明。
DTD is used by SGML applications, such as HTML, to specify rules that apply to the markup of documents of a particular type, including a set of element and entity declarations.
DTD是通过SGML应用程序来使用的，就像HTML，来指明适用于特殊类型的文档标记，包括元素集合和特殊个体的声明。
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